Karen (かれん Karen) is a supporting character in the anime and manga: Mermaid Melody.

PersonalityKaren is a very mysterious character. Most of the time, she is calm and mature; however, she acts coldly towards the other mermaid princess'. Other than that, she is very loyal to her friends and loves her sister, Noel, very much, long before she even met her.

AppearanceKaren has long, dark purple hair with curled ends, and her eyes are purple, just like her hair. Karen is also taller than most of the other mermaid princesses. She has a birthmark on her right cheek.Forms and Aspects​Karen, just like the other mermaid princesses, has three forms. This includes her human, mermaid and idol forms.​Human FormIn her human form, Karen has dark purple hair with ringlets and pale skin as well as medium brown eyes. Karen, like other mermaid princesses wears a necklace around her neck carrying a purple shell, containing her precious, purple pearl.Mermaid FormKaren follows the trend of all the other mermaid princesses, two pearl bracelets around her right wrist and long, dark, purple tail.

Idol FormLastly, there is her idol form called 'Purple Pearl Voice'. Her costume is a white short strapless dress with black purple ruffles down the one side and it is above knee length with purple trim at top. Her bow is the same color as her hair, but in a darker shade. Her gloves are white with purple cuffs that extend to her mid arm and her high-heeled boots have the same colors. She has a purple seashell barrette in her hair. Her idol form is very similar to Noel's form, due to them being twins.